France — the world’s top tourist destination — was particularly hard hit. It suffered a 4% drop in visitors last year after high-profile terror attacks and strikes by air traffic controllers. Tourism spending fell by 11% between 2014 and 2016.

The appeal of London, a traditional magnet for international visitors, has also been tarnished following a March terror attack. A survey by travel agents network Travel Leaders Group found that 27% of American respondents are reluctant to fly to the city in the near future.

Latin America: The threat of contracting Zika has discouraged many young couples and pregnant women from visiting large swaths of Latin America.

“Last year was definitely a bad year for this market because we had a lot of cancellations,” said Lisa Sheldon, executive director at the Destination Wedding & Honeymoon Specialists Association. “It’s still a concern for some couples.”

Sheldon estimated that 60% of couples bring this topic up with her network of travel agents when discussing honeymoon locations and destination weddings. About half of those travelers eventually opt for Zika-free areas.

Travelers are becoming increasingly cautious as they plan their trips.

In March, Trump announced a 90-day freeze on visas for citizens of six Muslim-majority countries. Courts have blocked the visa restrictions. The Trump administration also banned travelers from 10 airports in Muslim majority countries from bringing many electronic devices into the plane cabin.

“This has really caused people from outside the U.S. to … think twice before they come here,” said Surry.

One study forecasts a 10.6 million — or 7% — decline in visitors this year and next.

Middle Eastern arrivals to the U.S. fell by 9.5% and European arrivals dropped 6.5% in the first quarter of the year, according to travel intelligence firm ForwardKeys.

Chinese searches for U.S. flights dropped by more than 50% after Trump first attempted to implement a travel ban in January. Chinese tourists led the world in spending last year, shelling out a total of $261 billion.

South Korea: Chinese tour groups have been canceling trips because of anger over the deployment of a controversial U.S.-built missile defense system in South Korea. Chinese authorities are believed to have told travel agencies last month to stop selling trips to South Korea.

The country suffered a 40% plunge in Chinese visitors last month, according to the Korea Tourism Organization.

The outlook is bleak, too. Bookings for stays of four to eight nights by Chinese visitors are down 28% in the second quarter of 2017 compared with a year earlier, according to ForwardKeys.